package com.bitcola.exchange.security.me.util;

import org.apache.commons.io.FileUtils;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 头像生成
 *
 *  @author wx
 * @create 2018-08-31 00:18
 **/
public class UserAvatarUtil {

        /**
         * 绘制字体头像
         * 如果是英文名，只显示首字母大写
         * 如果是中文名，只显示最后两个字
         * @param name
         * @throws IOException
         */
        public static InputStream generateImg(String name)
                throws IOException {
            int width = 100;
            int height = 100;
            int nameLen = name.length();
            String nameWritten;
            //如果用户输入的姓名少于等于2个字符，不用截取
            if (nameLen <= 2) {
                nameWritten = name;
            } else {
                //如果用户输入的姓名大于等于3个字符，截取后面两位
                String first = name.substring(0, 1);
                if (isChinese(first)) {
                    //截取倒数两位汉字
                    nameWritten = name.substring(nameLen - 2);
                } else {
                    //截取前面的两个英文字母
                    nameWritten = name.substring(0, 2).toUpperCase();
                }
            }
            //Font font = new Font("微软雅黑", Font.PLAIN, 30);
            BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = (Graphics2D) bi.getGraphics();
            g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g2.setBackground(getRandomColor());
            g2.clearRect(0, 0, width, height);
            g2.setPaint(Color.WHITE);
            Font font = null;
            //两个字及以上
            if(nameWritten.length() >= 2) {
                font = new Font("微软雅黑", Font.PLAIN, 30);
                g2.setFont(font);
                String firstWritten = nameWritten.substring(0, 1);
                String secondWritten = nameWritten.substring(1, 2);
                //两个中文 如 言曌
                if (isChinese(firstWritten) && isChinese(secondWritten)) {
                    g2.drawString(nameWritten, 20, 60);
                }
                //首中次英 如 罗Q
                else if (isChinese(firstWritten) && !isChinese(secondWritten)) {
                    g2.drawString(nameWritten, 27, 60);
                    //首英,如 AB
                } else {
                    nameWritten = nameWritten.substring(0,1);
                }
            }
            //一个字
            if(nameWritten.length() ==1) {
                //中文
                if(isChinese(nameWritten)) {
                    font = new Font("微软雅黑", Font.PLAIN, 50);
                    g2.setFont(font);
                    g2.drawString(nameWritten, 25, 70);
                }
                //英文
                else {
                    font = new Font("微软雅黑", Font.PLAIN, 55);
                    g2.setFont(font);
                    g2.drawString(nameWritten.toUpperCase(), 33, 67);
                }
            }
            BufferedImage rounded = makeRoundedCorner(bi, 99);
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
            ImageIO.write(rounded, "png", imOut);
            return new ByteArrayInputStream(bs.toByteArray());
        }
        /**
         * 判断字符串是否为中文
         * @param str
         * @return
         */
        public static boolean isChinese(String str) {
            String regEx = "[\\u4e00-\\u9fa5]+";
            Pattern p = Pattern.compile(regEx);
            Matcher m = p.matcher(str);
            if (m.find())
                return true;
            else
                return false;
        }
        /**
         * 获得随机颜色
         * @return
         */
        private static Color getRandomColor() {
            String[] beautifulColors =
                    new String[]{"232,221,203", "205,179,128", "3,101,100",
                            "237,222,139", "251,178,23", "96,143,159", "1,77,103", "254,67,101", "252,157,154",
                            "249,205,173", "200,200,169", "131,175,155", "229,187,129", "161,23,21", "34,8,7",
                            "118,77,57", "17,63,61", "60,79,57", "95,92,51", "179,214,110", "248,147,29",
                            "227,160,93", "178,190,126", "114,111,238", "56,13,49", "89,61,67", "250,218,141",
                            "3,38,58", "179,168,150", "222,125,44", "20,68,106", "130,57,53", "137,190,178",
                            "201,186,131", "222,211,140", "222,156,83", "23,44,60", "39,72,98", "153,80,84",
                            "217,104,49", "230,179,61", "174,221,129", "107,194,53", "6,128,67", "38,157,128",
                            "178,200,187", "69,137,148", "117,121,71", "114,83,52", "87,105,60", "82,75,46",
                            "171,92,37", "100,107,48", "98,65,24", "54,37,17", "137,157,192", "250,227,113",
                            "29,131,8", "220,87,18", "29,191,151", "35,235,185", "213,26,33", "160,191,124",
                            "101,147,74", "64,116,52", "255,150,128", "255,94,72", "38,188,213", "167,220,224",
                            "1,165,175", "179,214,110", "248,147,29", "230,155,3", "209,73,78", "62,188,202",
                            "224,160,158", "161,47,47", "0,90,171", "107,194,53", "174,221,129", "6,128,67",
                            "38,157,128", "201,138,131", "220,162,151", "137,157,192", "175,215,237", "92,167,186",
                            "255,66,93", "147,224,255", "247,68,97", "185,227,217"};
            int len = beautifulColors.length;
            Random random = new Random();
            String[] color = beautifulColors[random.nextInt(len)].split(",");
            return new Color(Integer.parseInt(color[0]), Integer.parseInt(color[1]),
                    Integer.parseInt(color[2]));
        }
        /**
         * 图片做圆角处理
         * @param image
         * @param cornerRadius
         * @return
         */
        public static BufferedImage makeRoundedCorner(BufferedImage image, int cornerRadius) {
            int w = image.getWidth();
            int h = image.getHeight();
            BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2 = output.createGraphics();
            g2.setComposite(AlphaComposite.Src);
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setColor(Color.WHITE);
            g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius, cornerRadius));
            g2.setComposite(AlphaComposite.SrcAtop);
            g2.drawImage(image, 0, 0, null);
            g2.dispose();
            return output;
        }

}
